Spiral metering scale

Abstract

A spiral metering scale relates to the technical field of spiral metering scales and comprises a supporting frame, two fixing seats are welded to the top of the supporting frame, bearing seats are detachably arranged at the tops of the fixing seats, a cylinder is arranged above the supporting frame, two fixing rods are welded to the outer wall of the cylinder, and the two fixing rods are arranged on the outer wall of the cylinder. The two fixing rods correspondingly extend into the two bearing seats and are rotationally connected with the bearing seats, a sealing flange and a sealing plate which are detachably arranged are arranged at the two ends of the barrel respectively, an auger shaft which is rotationally arranged is coaxially arranged in the barrel, spiral blades are welded to the outer wall of the auger shaft, and the two ends of the auger shaft are rotationally connected with the sealing flange and the sealing plate correspondingly. A driving assembly for driving the auger shaft is arranged at the end of the sealing plate, and a connecting assembly is welded to the top of the supporting frame. And a feeding pipe and a discharging hopper which are communicated with the inner cavity of the barrel are welded on the outer wall of the barrel. The problem that an existing spiral metering scale is low in metering accuracy is solved. And the installation process is complicated.

Description

Technical Field

[0001] The invention relates to the technical field of spiral measuring scales, in particular to a spiral measuring scale. Background Art

[0002] The spiral metering scale is a production metering equipment for controlling feeding, dynamic metering and continuous conveying of powdered and bulk materials. According to the process requirements, the material flow and direction of the screw conveyor are continuously controlled and metered to achieve automatic management.

[0003] When the spiral metering scale transports materials, the materials are conveyed by the screw conveyor. The weighing sensor installed on the barrel detects the weight of the material and generates a voltage signal proportional to the weighing load, which is sent to the controller. The instantaneous flow rate and cumulative weight value are calculated together with the detection data of the auger shaft speed by the speed sensor. The control system compares the actual flow signal with the set flow signal, outputs the control signal to the frequency converter through PID regulation, and dynamically adjusts the speed of the motor to achieve quantitative feeding. The spiral metering scale is mainly composed of a conveying screw, a frequency converter, a load sensor, a speed sensor and a controller.

[0004] The existing spiral weighing scales gradually exposed their shortcomings during use, mainly in the following aspects: First, the material metering accuracy is low. Specifically, the material is transported through the spiral blades in the cylinder. When the cumulative weight of the transported material is close to the preset weight value, the controller controls the motor to reduce the speed, thereby slowing down the material transportation speed. When the cumulative weight of the transported material reaches the preset weight value, the controller controls the motor to stop rotating, thereby stopping the transportation of the material. When the spiral blades are transporting materials, the materials are pushed forward along the surface of the spiral blades. The transported materials occupy most of the space inside the cylinder. When the motor stops running, part of the material pushed by the spiral blades closest to the discharge port will still be discharged through the discharge port. The part of the material that falls out is excess material. Therefore, the actual transportation volume of the material is greater than the actual demand, which leads to low material metering accuracy. Moreover, the larger the spiral blades, the more excess material there is, and the lower the metering accuracy.

[0005] Second, the installation process is complicated. Specifically, during the material transportation process, the load sensor needs to detect the weight of the cylinder. Therefore, the cylinder cannot be hard-connected to the silo, and can only be soft-connected. The spiral metering scale needs to be welded at the bottom of the silo during installation, and then the spiral metering scale is installed on the base and soft-connected to the silo. Therefore, the installation process of the spiral metering scale is complicated, time-consuming and labor-intensive.

[0006] In summary, the prior art obviously has inconveniences and defects in practical use, so it is necessary to improve it. Summary of the invention

[0007] In view of the defects in the prior art, the technical problem to be solved by the present invention is to provide a spiral metering scale, the metering accuracy of which is ≤2‰, while the metering accuracy of the existing spiral metering scale is ≤2%, which greatly improves the accuracy of material metering; The spiral metering scale can be quickly connected to the silo, which simplifies the installation process and improves the practicability of the equipment.

[0008] To solve the above problems, the present invention provides the following technical solutions: A spiral metering scale comprises a support frame, two fixing seats are welded on the top of the support frame, a detachable bearing seat is arranged on the top of the fixing seat, a cylinder is arranged above the support frame, two fixing rods are welded on the outer wall of the cylinder, the two fixing rods extend into the two bearing seats correspondingly and are rotatably connected to the bearing seats, a detachable sealing flange and a sealing plate are arranged at both ends of the cylinder respectively, a rotatable auger shaft is coaxially arranged in the cylinder, a spiral blade is welded on the outer wall of the auger shaft, two ends of the auger shaft are rotatably connected with the sealing flange and the sealing plate correspondingly, a driving assembly for driving the auger shaft is arranged at the end of the sealing plate, and a connecting assembly is welded on the top of the support frame; The outer wall of the cylinder is welded with a feed pipe and a discharge hopper connected with its inner cavity, and a detachable connecting pipe is provided below the discharge hopper, and a lifting cylinder is coaxially provided in the connecting pipe, and a circular groove is provided on the top of the lifting cylinder, and a rotating circular plate that is in frictional contact with the lifting cylinder is rotatably provided in the circular groove, and an arc groove is provided through the top of the rotating circular plate and the bottom of the circular groove, and a detachable fixed circular plate is inserted into the inner wall of one end of the arc groove, and a discharge hole is penetrated on the top of the fixed circular plate, and a discharge pipe connected with the arc groove is fixedly connected to the inner top of the lifting cylinder.

[0009] As an optimized solution, the top of the lifting cylinder is a truncated cone structure, and an annular groove is provided on the outer wall of the lifting cylinder along the circumferential direction, and a rubber sheet is laid in the annular groove.

[0010] As an optimized solution, the connecting assembly includes a horizontally arranged connecting plate, four support seats are welded on the top of the support frame, the support seats are detachably connected to the connecting plate, the upper port of the feed pipe is provided with a detachably arranged canvas soft connection, the top of the connecting plate is provided with a through-set feed port, and the top of the connecting plate is provided with a plurality of through-set positioning holes evenly distributed along the circumference of the feed port.

[0011] As an optimized solution, a U-shaped frame is welded to the top of the support frame, and U-shaped plates are welded to the inner top of the U-shaped frame and the upper outer wall of the cylinder. A load sensor is provided between the two U-shaped plates, and the load sensor is detachably connected to the two U-shaped plates through studs and nuts.

[0012] As an optimized solution, the drive assembly includes a fixing frame welded to the end of the sealing plate, a detachable reducer is provided on the top of the fixing frame, a detachable drive motor is provided on the end of the reducer, the output shaft of the drive motor is connected to the input shaft of the reducer, one end of the auger shaft passes through the sealing plate and is connected to the output shaft of the reducer through a coupling, and a speed sensor for detecting the rotational speed of the auger shaft is provided at the end of the sealing plate.

[0013] As an optimized solution, a horizontally arranged fixing plate is fixedly provided in the connecting tube, two electrically controlled telescopic cylinders are fixedly provided on the top of the fixing plate, and the output ends of the electrically controlled telescopic cylinders are fixedly connected to the lifting cylinder.

[0014] As an optimized solution, the fixing plate is fixedly connected to the connecting pipe via a connecting rod.

[0015] As an optimized solution, a rotating shaft is coaxially provided on the inner bottom of the circular groove, the rotating shaft is coaxially fixed to the rotating circular plate, a control motor is fixed on the inner top of the lifting cylinder, and the output shaft of the control motor is fixedly connected to the rotating shaft.

[0016] As an optimized solution, the inner wall of the arc groove is provided with a slot, the side wall of the fixed circular plate is fixed with an insert plate, the insert plate is connected to the rotating circular plate or the lifting cylinder by screws, and the thickness of the fixed circular plate is the same as the depth of the arc groove.

[0017] Compared with the prior art, the present invention has the following beneficial effects: 1. When connecting the spiral metering scale to the silo, lift the spiral metering scale until the connecting plate is against the silo discharge port and align the positioning hole with the hole on the silo discharge port flange. Pass the bolts through the flange hole of the upper port of the canvas flexible connection, the positioning hole and the flange hole of the silo discharge port in sequence and fix them with nuts to connect the spiral metering scale to the silo. The feed pipe is connected to the silo through the canvas flexible connection. The spiral metering scale can be quickly connected to the silo, which simplifies the installation process and improves the practicality of the equipment. 2. When quantitatively conveying materials, the materials in the silo enter the cylinder through the feed pipe, and the drive motor drives the auger shaft and spiral blades to rotate. The spiral blades push the materials in the cylinder forward, and the materials in the cylinder are discharged through the discharge hopper and the connecting pipe. At the same time, the load sensor detects the weight of the materials in the cylinder, and the speed sensor detects the speed of the auger shaft. The detection data is transmitted back to the controller, and the controller calculates the detection data to obtain the instantaneous flow rate and cumulative weight value. When the cumulative weight value of the conveyed material is close to the preset weight value, the controller controls the drive motor to reduce the speed, thereby slowing down the transportation speed of the material. At the same time, the controller controls the electric control telescopic cylinder to extend until the lifting cylinder is against the discharge hopper, thereby closing the discharge channel. After a certain amount of material accumulates in the discharge hopper, the drive motor stops rotating, and the control motor advances. The spiral metering scale has a measuring accuracy of ≤2‰, while the measuring accuracy of the existing spiral metering scale is ≤2%. This greatly improves the accuracy of material measurement. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following is a brief introduction to the drawings required for the specific embodiments or the description of the prior art. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn according to the actual scale.

[0019] Figure 1 It is a structural schematic diagram of the present invention; Figure 2 It is a schematic diagram of the structure inside the cylinder of the present invention; Figure 3 It is a schematic diagram of the structure inside the lifting cylinder of the present invention; Figure 4 It is a schematic diagram of the structure of the lifting cylinder and the rotating circular plate of the present invention; Figure 5 It is a structural schematic diagram of the connection assembly of the present invention; Figure 6 It is a structural schematic diagram of the U-shaped frame of the present invention; Figure 7 It is a schematic structural diagram of the arc groove and the fixed circular plate of the present invention.

[0020] In the figure: 1-support frame; 2-bearing seat; 3-fixed seat; 4-fixed rod; 5-fixed frame; 6-coupling; 7-drive motor; 8-drive assembly; 9-reducer; 10-sealing plate; 11-connecting assembly; 12-feeding pipe; 13-barrel; 14-sealing flange; 15-discharge hopper; 16-spiral blade; 17-auger shaft; 18-speed sensor; 19-U-shaped frame; 20-load sensor; 21-U-shaped plate; 22-rubber Plate; 23-lifting cylinder; 24-connecting pipe; 25-discharging pipe; 26-annular groove; 27-circular groove; 28-rotating circular plate; 29-discharging hole; 30-fixed circular plate; 31-arc groove; 32-rotating shaft; 33-control motor; 34-electric telescopic cylinder; 35-connecting rod; 36-fixed plate; 37-insertion plate; 38-slot; 39-positioning hole; 40-feeding port; 41-connecting plate; 42-support seat; 43-canvas soft connection. DETAILED DESCRIPTION

[0021] The following embodiments of the technical solution of the present invention are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and are therefore only used as examples, and cannot be used to limit the protection scope of the present invention.

[0022] like Figures 1 to 7 As shown, a spiral metering scale comprises a support frame 1, two fixing seats 3 are welded on the top of the support frame 1, a detachable bearing seat 2 is arranged on the top of the fixing seat 3, a cylinder 13 is arranged above the support frame 1, two fixing rods 4 are welded on the outer wall of the cylinder 13, the two fixing rods 4 extend into the two bearing seats 2 correspondingly and are rotatably connected with the bearing seats 2, a detachable sealing flange 14 and a sealing plate 10 are respectively arranged at both ends of the cylinder 13, a rotatable auger shaft 17 is coaxially arranged in the cylinder 13, a spiral blade 16 is welded on the outer wall of the auger shaft 17, two ends of the auger shaft 17 are rotatably connected with the sealing flange 14 and the sealing plate 10 correspondingly, a driving assembly 8 for driving the auger shaft 17 is arranged at the end of the sealing plate 10, and a connecting assembly 11 is welded on the top of the support frame 1; The outer wall of the cylinder 13 is welded with a feed pipe 12 and a discharge hopper 15 connected with its inner cavity. A detachable connecting pipe 24 is provided below the discharge hopper 15. A lifting cylinder 23 is coaxially provided in the connecting pipe 24. A circular groove 27 is provided on the top of the lifting cylinder 23. A rotating circular plate 28 that is in frictional contact with the lifting cylinder 23 is rotatably provided in the circular groove 27. An arc groove 31 is penetrated through the top of the rotating circular plate 28 and the bottom of the circular groove 27. A detachable fixed circular plate 30 is inserted into the inner wall of one end of the arc groove 31. A discharge hole 29 is penetrated on the top of the fixed circular plate 30. A discharge pipe 25 connected to the arc groove 31 is fixedly connected to the inner top of the lifting cylinder 23.

[0023] The top of the lifting cylinder 23 is a truncated cone structure. An annular groove 26 is provided on the outer wall of the lifting cylinder 23 along the circumferential direction. A rubber sheet 22 is laid in the annular groove 26 .

[0024] The connecting assembly 11 includes a horizontally arranged connecting plate 41, four supporting seats 42 are welded on the top of the support frame 1, the supporting seats 42 are detachably connected to the connecting plate 41, the upper port of the feed pipe 12 is provided with a detachably arranged canvas soft connection 43, the top of the connecting plate 41 is provided with a penetrating feed port 40, and the top of the connecting plate 41 is evenly distributed with a number of penetrating positioning holes 39 along the circumference of the feed port 40.

[0025] A U-shaped frame 19 is welded to the top of the support frame 1, and U-shaped plates 21 are welded to the inner top of the U-shaped frame 19 and the upper outer wall of the cylinder 13. A load sensor 20 is arranged between the two U-shaped plates 21, and the load sensor 20 is detachably connected to the two U-shaped plates 21 through studs and nuts.

[0026] The driving assembly 8 includes a fixing frame 5 welded to the end of the sealing plate 10, a detachable reducer 9 is provided on the top of the fixing frame 5, a detachable driving motor 7 is provided on the end of the reducer 9, the output shaft of the driving motor 7 is connected to the input shaft of the reducer 9, one end of the auger shaft 17 passes through the sealing plate 10 and is connected to the output shaft of the reducer 9 through the coupling 6, and a speed sensor 18 for detecting the rotation speed of the auger shaft 17 is provided at the end of the sealing plate 10.

[0027] A horizontally arranged fixing plate 36 is fixedly provided in the connecting pipe 24 , and two electrically controlled telescopic cylinders 34 are fixedly provided on the top of the fixing plate 36 . The output ends of the electrically controlled telescopic cylinders 34 are fixedly connected to the lifting cylinder 23 .

[0028] The fixing plate 36 is fixedly connected to the connecting pipe 24 via a connecting rod 35 .

[0029] A rotating shaft 32 is coaxially provided at the inner bottom of the circular groove 27 , and the rotating shaft 32 is coaxially fixed to the rotating circular plate 28 . A control motor 33 is fixedly provided at the inner top of the lifting cylinder 23 , and the output shaft of the control motor 33 is fixedly connected to the rotating shaft 32 .

[0030] The inner wall of the arc groove 31 is provided with a slot 38 , and the side wall of the fixed circular plate 30 is fixed with an inserting plate 37 , which is connected to the rotating circular plate 28 or the lifting cylinder 23 by screws. The thickness of the fixed circular plate 30 is the same as the depth of the arc groove 31 .

[0031] The driving motor 7 and the control motor 33 are both electrically connected to the controller via a frequency converter, and the load sensor 20, the speed sensor 18 and the electric control telescopic cylinder 34 are electrically connected to the controller.

[0032] The working principle of this device is: When the spiral metering scale is connected to the silo, the spiral metering scale is lifted until the connecting plate 41 is against the silo discharge port and the positioning hole 39 is aligned with the eyelet on the silo discharge port flange, and the bolts are sequentially passed through the upper end flange eyelet of the canvas flexible connection 43, the positioning hole 39 and the silo discharge port flange eyelet and fixed with nuts, and then the spiral metering scale is connected to the silo, and the feed pipe 12 is softly connected to the silo through the canvas flexible connection 43. The spiral metering scale can be quickly connected to the silo, which simplifies the installation process and improves the practicality of the equipment; When quantitatively conveying materials, the materials in the silo enter the barrel 13 through the feed pipe 12, and the driving motor 7 drives the auger shaft 17 and the spiral blade 16 to rotate. The spiral blade 16 pushes the materials in the barrel 13 forward, and the materials in the barrel 13 are discharged through the discharge hopper 15 and the connecting pipe 24. At the same time, the load sensor 20 detects the weight of the materials in the barrel 13, and the speed sensor 18 detects the rotation speed of the auger shaft 17. The detection data is transmitted back to the controller, and the controller calculates the detection data to obtain the instantaneous flow rate and the cumulative weight value. When the cumulative weight value of the conveyed material is close to the preset weight value, the controller controls the driving motor 7 to reduce the rotation speed, thereby slowing down the transportation speed of the material. At the same time, the controller controls the electric control telescopic cylinder 34 to extend until the lifting cylinder 23 is against the discharge hopper 15, thereby closing the discharge channel. After a certain amount of material is accumulated in the discharge hopper 15, the driving motor 7 stops rotating and controls The motor 33 rotates until the rotating circular plate 28 and the arc groove 31 on the lifting cylinder 23 are completely overlapped, and the material accumulated in the discharge hopper 15 is discharged outward through the arc groove 31 and the discharge pipe 25. The load sensor 20 detects the weight change of the material. As the cumulative discharge weight value of the material approaches the preset weight value, the control motor 33 is slowly reset until the two fixed circular plates 30 are completely overlapped. At this time, a very small amount of material in the discharge hopper 15 is discharged through the discharge hole 29. When the cumulative discharge weight value of the material reaches the preset weight value, the control motor 33 drives the rotating circular plate 28 to reset, and then closes the discharge channel again. When the cumulative discharge weight value of the material is closer to the preset weight value, the discharge channel of the material is smaller, which effectively prevents the problem of excessive discharge of material at the end of the discharge period. The measurement accuracy of the spiral metering scale is ≤2‰, while the measurement accuracy of the existing spiral metering scale is ≤2%, which greatly improves the accuracy of material measurement.

[0033] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. These modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be included in the scope of the claims and specification of the present invention.

Claims

1. A spiral weighing scale, characterized in that: The invention comprises a support frame (1), wherein two fixing seats (3) are welded to the top of the support frame (1), a detachably arranged bearing seat (2) is arranged on the top of the fixing seat (3), a cylinder (13) is arranged above the support frame (1), two fixing rods (4) are welded to the outer wall of the cylinder (13), the two fixing rods (4) extend into the two bearing seats (2) respectively and are rotatably connected to the bearing seats (2), two ends of the cylinder (13) are respectively provided with a detachably arranged sealing flange (14) and a sealing plate (10), a rotatably arranged auger shaft (17) is coaxially arranged in the cylinder (13), a spiral blade (16) is welded to the outer wall of the auger shaft (17), two ends of the auger shaft (17) are rotatably connected to the sealing flange (14) and the sealing plate (10), and a driving assembly (8) for driving the auger shaft (17) is arranged at the end of the sealing plate (10), and a connecting assembly (11) is welded to the top of the support frame (1); A feed pipe (12) and a discharge hopper (15) which are in communication with the inner cavity of the cylinder (13) are welded to the outer wall of the cylinder (13). A detachable connecting pipe (24) is provided below the discharge hopper (15). A lifting cylinder (23) which is arranged to be lifted and lowered is coaxially arranged in the connecting pipe (24). A circular groove (27) is provided at the top of the lifting cylinder (23). A rotating circular plate (28) which is in frictional contact with the lifting cylinder (23) is rotatably arranged in the circular groove (27). An arc groove (31) is provided through the top of the rotating circular plate (28) and the bottom of the circular groove (27). A detachable fixed circular plate (30) is inserted into the inner wall of one end of the arc groove (31). A discharge hole (29) is provided through the top of the fixed circular plate (30). A discharge pipe (25) which is in communication with the arc groove (31) is fixedly connected to the inner top of the lifting cylinder (23).

2. A spiral weighing scale according to claim 1, characterized in that: The top of the lifting cylinder (23) is a truncated cone-shaped structure, and an annular groove (26) is provided on the outer wall of the lifting cylinder (23) along the circumferential direction, and a rubber sheet (22) is laid in the annular groove (26).

3. A spiral weighing scale according to claim 1, characterized in that: The connection assembly (11) includes a horizontally arranged connection plate (41), four support seats (42) are welded to the top of the support frame (1), the support seats (42) are detachably connected to the connection plate (41), the upper end of the feed pipe (12) is provided with a detachably arranged canvas soft connection (43), the top of the connection plate (41) is provided with a feed port (40) extending therethrough, and the top of the connection plate (41) is provided with a plurality of positioning holes (39) uniformly distributed along the circumference of the feed port (40).

4. A spiral weighing scale according to claim 1, characterized in that: A U-shaped frame (19) is welded to the top of the support frame (1), and a U-shaped plate (21) is welded to the inner top of the U-shaped frame (19) and the upper outer wall of the cylinder (13). A load sensor (20) is provided between the two U-shaped plates (21), and the load sensor (20) is detachably connected to the two U-shaped plates (21) via studs and nuts.

5. A spiral weighing scale according to claim 1, characterized in that: The driving assembly (8) comprises a fixing frame (5) welded to the end of a sealing plate (10); a detachably arranged reducer (9) is provided on the top of the fixing frame (5); a detachably arranged driving motor (7) is provided at the end of the reducer (9); an output shaft of the driving motor (7) is connected to an input shaft of the reducer (9); one end of the auger shaft (17) passes through the sealing plate (10) and is connected to the output shaft of the reducer (9) via a coupling (6); and a speed sensor (18) for detecting the rotation speed of the auger shaft (17) is provided at the end of the sealing plate (10).

6. A spiral weighing scale according to claim 1, characterized in that: A horizontally arranged fixing plate (36) is fixedly provided in the connecting pipe (24), two electrically controlled telescopic cylinders (34) are fixedly provided on the top of the fixing plate (36), and output ends of the electrically controlled telescopic cylinders (34) are fixedly connected to the lifting cylinder (23).

7. A spiral weighing scale according to claim 6, characterized in that: The fixing plate (36) is fixedly connected to the connecting pipe (24) via a connecting rod (35).

8. A spiral weighing scale according to claim 1, characterized in that: A rotating shaft (32) is coaxially provided on the inner bottom of the circular groove (27) and is fixedly connected coaxially to the rotating circular plate (28). A control motor (33) is fixedly provided on the inner top of the lifting cylinder (23), and an output shaft of the control motor (33) is fixedly connected to the rotating shaft (32).

9. A spiral weighing scale according to claim 1, characterized in that: The inner wall of the arc-shaped groove (31) is provided with a slot (38), the side wall of the fixed circular plate (30) is fixedly connected with an inserting plate (37), the inserting plate (37) is connected to the rotating circular plate (28) or the lifting cylinder (23) by means of screws, and the thickness of the fixed circular plate (30) is the same as the depth of the arc-shaped groove (31).

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